Expanded granulated cork for thermal and acoustic insulation 4-8mm - 2000l (2 m3) - 140kg

We offer four fractions: 2–4 mm, 2–9 mm, 4–8 mm, and 3–15 mm.

Small pieces of expanded cork – this lightweight, nature-made material actually performs better than regular cork in insulation.

Expanded cork is produced by heating cork oak bark until it expands and turns a rich brown. No artificial additives are used – the method is entirely natural. It contains suberin, a plant-based resin that acts as a glue when heated, holding the cork together organically.

It's used most often in building work, including:

• insulating lofts, floors, ceilings, and walls – especially tricky or tight spaces,
• filling gaps in cavity walls, hollow walls, and thermal insulation partition systems,
• roof insulation – poured between rafters in pitched roofs,
• underneath floors or inside structural voids,
• level-adjusting uneven floor or ceiling sections,
• dry screed applications,
• creating lightweight base layers for floors.

But it's not just for building – other uses include:

• terrariums – a safe, natural bedding for exotic animals and reptiles,
• gardening – as a mulch or decorative layer under plants, instead of pine bark,
• film work – simulating soil, rocks or debris for action scenes,
• model construction – ideal for miniature builds and creative dioramas.

Mainly because of its excellent insulating ability – it blocks heat and noise better than traditional natural cork.

Other useful traits include:

• Lightweight – won’t strain building structures,
• Naturally defends against mould, pests, and fungi,
• Inert – doesn’t react with chemicals,
• Keeps its shape long-term,
• Long-lasting and reliable,
• Naturally biodegradable and environmentally friendly,
• Can tolerate extreme cold and heat – from –180°C to +120°C without damage,
• Fire-safe with Euroclass E rating – no harmful gases when exposed to flames.

Yes, these cork granules are certified with a Polish hygienic approval from the National Institute of Public Health. They’ve been verified as non-allergenic, non-irritant, and safe to use. We're proud to be the only company in Poland currently holding this certificate.

Yes indeed – cork is one of the greenest materials available. It's harvested from the bark of cork oaks, so there’s no need to cut down any trees. The bark regrows naturally every 9 to 12 years, making it a renewable resource that doesn't harm the tree or the environment. These trees can live for centuries – even over 200 years!

Even better, cork is known for its carbon-negative impact. In fact, cork oaks can absorb up to four times more CO₂ than other tree species.

Expanded cork granules are built to last – their performance can remain effective for up to 50 years.

It has a rich dark brown look, created through high-heat treatment. There’s no added colouring or paint involved.

For grain sizes ranging between 2 and 9 mm, the density falls around 70–80 kilograms per cubic metre.

Yes, we also have expanded cork available in sheet form.

Overall, cork comes out on top. Foam is synthetic and tends to break down with time – it can shift, crack, or lose its insulating seal. Plus, producing foam has a pretty large environmental impact.

Meanwhile, cork:

• Has much better long-term durability,
• Is completely natural and harmless – safe for health and the planet,
• Resists mould, pests, and fungal growth,
• Is biodegradable and contributes positively to CO₂ absorption.

Store them in a place that’s dry and has good air circulation. Don’t leave them in damp basements or under plastic sheeting outside. Keep them away from heaters and direct sunlight too.

To keep it simple: they should stay dry, well-ventilated, and away from any heat sources or sun exposure.